Water-tube back-head connection for rock drills



June 3o, 1925."

'w. PRELLwlTz WATER TUBE BACK HEAD CONNECTION FOR ROCK DRILLS l'NvENoRHag ATTO NEY when:

Filed March 21. 1924 .ff/4 ...n

Patented June 30, 1925.

UNITED STATES atraen PATENT OFFICE. y

WILLIAM IPRELILIV'ILZ,v OF EASTON, PENNSYLVANIA, ASSIGNOR TOINGERSOLL-RAND COMPANY, OF JERSEY CITY, NEVI JERSEY, y.A CORPORATION FNEW JERSEY.

WATER-TUBE BACK-HEAD CONNECTION Fon' ROCK DRILLs.

Application filed March 21, 1924. Serial No. 700,789.

T 0 all whom t may concern.

Be it known that I, Timm-in PRELLWITZ,

a citizen of the United States, and a resident of Easton, county ofNorthampton, and State of Pennsylvania, have invented a cer- RockDrills, of which the following is a specification Yaccompanied bydrawings.

rThis vinvention relates tov rock drills of the hammer type, but moreparticularly to an improved connection between the liquidconductingftube and the back head of the rock drill, including animproved means forV removing theliquid conducting tube in the event ofbreakage thereto or for any other reason. ,v

Most rock Vdrills of the hammer type einploy a tube which 'extendsthrough the machine and a short distance into the drill steel forconveying liquid lunder pressure to the hollow bore of the drill steelfor the purpose of cleansing the drilled hole. Thesevtubes frequentlybecomes so'l damaged vthat they areof no further use which necessitatesthe removal of the old tube and the substitution" of a new tube.`Heretofore, much trouble`v and annoyance has been occasioned in the-removal of thedamaged tubes and usually special tools are required forthis operation. It has also been a difficult problem to ob- .tain aneflicient fluid tight connection be` tween the liquid conducting tubeand the back head and frequently the liquid (usually water) enters theworking parts of the machineand washes away the lubricant.V This, ofcourse, is disadvantageous andv tends to shorten .the vlife of the ma?chine.

By means of this invention theabove difiiculties are overcome` andaneflicient and reliable fluid tight Aconnection is obtained between theliquid conducting tubey and the back head of the machine and by meansofa stem, which is readily accessible, the

lliquid conducting tube andassociated parts may be conveniently vremovedfrom the back head of the machine", Another rfeaturel of this inventionresides in the provision of a vise formedonthe machine which is adaptedto receive `a sleeve secured to 'the liquid conductingtube to enablethesleeve and tube to beseparated from the back head plug so that` a newtube fmay be substituted therefor, .thereby eliminating the necessity`of specialtools;

varated from the'back head One object of this invention is to enable aliquid conducting tube to Vbe secured to a backend portion of a rockdrill in a simple/and improved manner so that an fenicient fluid tightconnection therebetween tain Water-Tube Back-'Head Connection for,`

fdrill to be readily removed without the use of special tools. f Y

A furtherv objectV of the invention'is to provide means on the rockdrill whichwill enable the liquid conducting tube to be sep plug withoutthe necessity. of special tools. Further objects of the invention willhereinafter appear and the invention consists in certain features of aconstruction and combination of elements described in the followingspecification, definedv in the appended claims and shown in theaccompanying drawings, in which Figure l is a side elevation partly invertical section of a rockdrill of the hammer type,

Figure 2 is an enlarged detailed vertical rsection of the connectionbetween the liquid conducting tube and the back head shown in Figure l,y

Figure 3 is a transverse section taken on the line 3 3 of Figure 2looking in the direction of the arrows,

Figure 4l is a perspective view of a portion of the back Vhead showingthe means for removing the liquid conducting tube from the back headplug,

Figure 5 is a sectionalelevation showing the invention applied to a rockdrill of the drifter type, and

Figure 6 is a sectional elevation showing a modified form of a watertube connection.V

Referring to the drawings, the invention vis shown embodied in a rockdrill of the jackhammer type having a cylinder A to v"which is connectedthe front head B by suitable side'boltsfnot shown) A chuck C is locatedin the front head B and is adapted to receive the drill steelD forreceiving'the `impact blows of the hammer piston E. A

front cylinder bushingr F preferably separatesthe cylinder A from: thefront head' Band in this instance a valve chest G is connected 'tothecylinder A. Motive fluid is supplied to the rock drill through theinletH and a suitable 'distributing 4,valve is located `in the 'valve v`chestG Vffordistributing the motive fluid to the hammer piston E.

A back head J is separated frolntlie cylbarl head L is-ilocatedAVinside't'heratchet ring K. Suitable paWls (not shown) are carried bythe rifle `ba'1"he"ad"L"and cooperate 'v'vith the ratchet ring Kfor-enablingfthe rifle-bar O to rotate in one direction but preventingrotation in the oppositedirection Suitable washers iP :are in :thisinstance located on the opposite ends @of rthe rilebar-head L. The'rifle bar lO v extends intoffthe-riiie .nut Q Acarried by lthe piston"andlasthe 'piston E reciprocates in the cylinder yrotationf-istiansmittefd:to-the` drill steel -D by *means of Ign this .instance theback head J isffo'rmed with a tubular extension R `l`on which isslidably 1A mounted -a-sleeye [S carriedA by the handle T. A[coilspri-njg U islinthis instance -Inounted in the'extension'Ran-d'vbearsat one -endagainst the inwardly @eX-tending flange V inthehandle -T andy-the other end @bears again'st -the botto-In 'of theextension R.

bln this manner the ars -and shocks :set -up .in theioperation of thetool will beabsorbed by thefcoilfspringfU land not transmitted lto -the-Qperator who V-graspsV-the handle T. However the arrangementlo-,thealbove mentioned cushion handle forms a subject inpatterofemygapplication orpatent, Serial No. -669,036; `=iled, September 11,`1923, =and further description here is deemed unnecessary.

-In accordance with vthis invention -a Vsleeve W 'ispreferably securedtothe fliqui'd yconvductingtube inany suitable' manner. The liquidconducting tube in thisfinstanceextendsfthrough-V--the rifle lbaiyheadLVril'e bar `O,piston E, Iand a `short distance finto the,

hollow bore of the drillsteel Ill-and is :for the purpose of 'conveyingliquid, Such as -Water,finto the drill steel D for cleansing thedrilled-hole oi-the cuttin-gs. The sleeve W is preferably formedWith'a-threade'd end` portion rY Whi'chfis adapted to beserewed into therecess -Zefornied in la `back head Plugw- Y A VAp tapered-portion -b isformed yon the sleeve and is -adapted,towcooperatepy vvfith a Yv-:tapered seat c orrned -,in theyback'head Splug l a for dori-ning JvaVfluid tight .connect-ion bertweenthe `fsleeveV MT and thebaclg Aheaelf`plugin.

The backl headV plujg fw fis \i n ;this' instance formed "withga@tapered portiond v vhichfis wafdapted to feoop'erate with -a taperedfseatj e ff'oifnied :filrthe back-head@ for #for-ming a iuifd tight?connection between: the baokhead plugafgand the back head -Jy Anvannular ygrooveff is fin :this instancejY-ermedsinlthe 4tajperelportiond of fthefbaekihead )plug a Sand communicates with fithefreeess :Z AbymeanS-foffalimssggeig-V Qlhe ld is Y I Aapreiferably {liter-ined wlth an1,111.6@ opweg Z which ,is adapted 'to v0 formedinithe back head J whichserves 4to holdtheplug a inposition relative to the` 'back head.l u uThe back head ,plug Aa is vpreferably formed with a stem Kv ichfliesinthe `holloWboi-e'oflthe back "head" extension ,R and fis in thisinstance `formed "with a head q which is provided With adiagonal "hole rY'iior'the receptionof as uitable tool,-such as a nail o1wvi1e,t`oenableth'e.back head plug a to fbe unscrewed yfrom the back "head U sothat the liquid conducting -tube X Vmay be Areadily removed from .theumachine. `The sleeve LW is @preferably formed4 with an yextensionlsliavi-ng Iiattened .portions t on opposite. vsides thereof4andalpair offlugs Awis preferably formed inran iipriglitgposition onthefba'ckheadd. Y y i A lThe iiattened ,portions t, of the "sleeve 'are.adaptedj'to @be inserted between the lugs fu gasishown'vin Figure 4 and:by applying a :fsuitable f tool, suchas 'a fivrench, tothe stern gporheadg of a backheadplug @,'theback head plug linay be separated `orremoved fitr-om the -tube X .andf sleeve l. :In this "manne-r the.necessity df `2.a special tool or tools forremovingthe back iheadQplug:tem the-liquid conducting tube isdlspensed with andthe vflugs 'uvserve'as :a viseifor holding the sleeve `against irotation while the"back '-hea'd vlug ris :removed (therefrom. V

y .Infthe y"mofdiiicaitiony'shown yin Figure f5, thefwa'ter 'tubeyconllection Vis illustrated as applied to a rock drill of the driitertype, in which Lplug nlV `is of cylindrical `shape Vand adaptedrtobescrewedinto f theloaekheadd of the.machine.` .Thegliqiiid fcoductingVtube is gproyided with "the sleeve NV having fthettapered @portion b andis infvot'her respectslike'the sleeveilV shown V:in Figure l. The wa-terVentr-gifsy the .tube

-through the Ainlet X and passes through `the lpa-sdsagefU in the 'plugl Ytothe tube. l This modified constructionfshown in Fi luref forms `.asimple l.uni-t ary" device adapte to v be applied tostandard rockdrills.

.nre ipwhlch'is substantially .like liligurev 5,

tbeisleeye VVQisf'inthe form oa-pipe having taperedpipe` threads whichare self tightening when the sleeve is ftlireedd im@ the plus d2, ThisP1P@ plus W is. me@

a recess in 'n-th :further modiiicationshowninFig or otherwisesecurelyfastened to the water y. tube X;

a back head having a recess and a passage communicatingV with saidrecessinto which liquid under pressure is adaped to be introduced, a memberscrewed into said recess and having a tapered portion ladapted tocooperate with a 'tapered seat in said recess to create af fluid tightconnection between Y said member' and .back head, said member beingformed with a recess adapted to communicate with the passage in saidback head, Va liquid conducting tube extending into said recess, and asleeve carried'by said tubeyand adapted to be screwed into the recess insaid member, said sleeve being formed with a tapered portion adapted tocooperate with a tapered seat in said member for creating a fluid tightconnection between said sleeve and member.

2. In a rock drill, the combination of a back head having a recess and apassage communicating with said recess into which liquid under pressureis adapted to be introduced, a back head plug adapted t0 be screwed intothe recess in said back head and having a 'tapered portion adapted tocooperate with a tapered seat in said recess to form a fluid tightconnection between said plug and back head, said plug being formed witha recess communicating with the passage in said back head, a liquidconducting tube adapted to extend into the recess in said plug, and asleeve. carried by said tube adapted to be screwed into said plug, saidsleeve being formed witha tapered portion adapted to cooperate with atapered seat in said plug for forming a fluid tight connection betweensaid sleeve and lu p In` a rock drill, the combination 0f a back headhaving a recess and a passage communicating with said recess throughwhich liquid under pressure is adapted to be forced, a member removablysecured in said recess and having a tapered portion adapted to cooperatewith a tapered seat in said recess to form a fluid tight connectionbetween said back head and member,

saidV member being formed with a recess adapted to lcommunicate with thepassage in saidvback head the inner end of said recess being tapered, aliquid conducting tube a fluid tight connection between the innertapered portion of said member and the Vtapered portion of said sleeve,and means 'carried `by said member adapted to enable said member' andtube to be removed from saidback head. p

4. In a rock drill, the combination of a back head having a recess and apassage communicating with said recess into which liquid under pressureis adapted tobe in troduced, a back head plug adapted to be screwed intothe recess in said back head and having a tapered portion adapted t0cooperate with a tapered seat in said recess to form a fiuid tightconnection between said plug and back head, said plug being formed witha recess communicating withl the passage in said back head, a liquidconducting tube adapted to extend into the recessin said plug, a sleevecarried by said tube adapted to be screwed .into said plug,-said sleevebeing formed with a tapered portion adapt,- ed to cooperate with atapered seat in said plug for forming a fluid tight connection betweensaid sleeve and plug, and a stem car ried by said .plug adapted toenable said plug, tube and sleeve to be removed from said back head as aunit.

5. In a rock drill, the combination of a back head having a passage intowhich liquid is adapted to be introduced, a back head plug removablysecured to said back head and having a recess adapted to communicatewith said passage, the inner end of said recess being tapered, a liquidconducting tube, a tapered sleeve having a threaded portion carried bysaid tube for removably securing said tube in said plug the taperedportions of the sleeve and the recess in the plug cooperating to form aseal and means on said sleeve to enable said sleeve and tube to beremoved from said plug.

6. In a rock drill, the combination of a back head having a recess and apassage comunicating with said recess into which liquid is adapted to beintroduced, a back head plug having a recess communicating with saidpassage andadapted to be screwed into said back head, said plug beingformed with a tapered portion adapted to cooperate with a tapered seatin said back head for formt ing a fluid tight connect-ion'between saidplug and back head, a liquid conducting tube adapted to extend into therecess in said plug, a sleeve carried by said tube and adapted to bescrewed into said plug, said sleeve being formed with a tapered portionadapted to cooperate with a tapered seat in said plug for forming afluid tight connection between said sleeve and plug, and means on saidsleeve for enabling said sleeve to be separated from said plug.

7. In a rock drill, the combination of a back head having a recess and apassage communicating with said recess into which liquid is adapted tobeintroduced, aback Y:lie'advfplug liaifiaig ya recess communicating Icess. insaid plug, said sleeve being formed with a taperedportioiiadapted to cooperate Witlia tapered seatriiifsaidgplug forforming a fluid `tight :connection Abetween ysaid sleeve andrpluggandliattened portions ormedon saidfs'leeife to I'eria-ble said sleeve tobejse'parated from fsaid plug. f

8. Ina rock du'illg the combination-of a back head having-a recessandapassage in commuiiicatio lWitlrsai'd recess into which )liquidr underpressure 1s adapted to be uitroduced, la' `:back 'head Vplughavinga'recess "adapted fto-coriimliiiiiciite l-Wicli said passage andalso adaptedto be screwed into the recess in said back head, said plugbeing kformed with a tapered-5porigio1iadapted to .cooperateyvitliatap'ered seat in said back headgto giorni va fluid tight connection.be-u' tweeiisaidliplug aud' `back head, 'a `liquid conducting tubeadapted :to .extend into tlie recess in said plug, a sleeyesecured tosaid tube and adapted Vto be screwed into the ,recess iii saidplug, saidv`sleeve being formed with u a tapered portion adapted tougcooperatewith aapered seatwiii said plug Lo form a fluid vtighft 1 connectionbetween `said plu i and able tool'lfor-eiiabliiig `said plug, sleeve andtube to beremoxfed from saidibaclrhead, and

lliatfceiied fportionsori opposite sides i of a ypor- `tion of saidsleeve,toeriablesaidvtube and `sleeve to beseparated from said plug.

'jlnftestimouyrWhereof I have signed this speciiic'ation.y A i w"JLAMPRELLWITZ

